NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 951
ONVOY, LLC - CA 14
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 1
BANDWIDTH.COM CLEC, LLC - CA 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2012-07-13 951-572-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2012-06-21 951-309-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K SUN CITY CA
2012-06-21 951-400-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-06-21 951-400-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-06-21 951-400-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-06-21 951-400-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-06-06 951-703-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MIRA LOMA CA
2012-06-06 951-800-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C WOODCREST CA
2012-06-06 951-900-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C RIVERSIDE CA
2012-06-05 951-305-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT HEMT CA
2012-06-05 951-331-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TEMECULA CA
2012-05-24 951-763-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT ANZA CA
2012-05-24 951-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2012-05-23 951-348-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D MURRIETA CA
2012-05-23 951-666-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2012-05-11 951-400-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PERRIS CA
2012-05-09 951-400-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2012-05-07 951-293-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2012-05-07 951-293-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2012-05-07 951-400-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2012-05-03 951-221-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K MORENO CA
2012-05-02 951-591-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K PERRIS CA
2012-04-25 951-348-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MURRIETA CA
2012-04-24 951-703-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MIRA LOMA CA
2012-04-24 951-800-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WOODCREST CA
2012-04-20 951-373-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2012-04-11 951-337-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2012-04-11 951-337-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2012-04-09 951-287-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-04-09 951-550-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-04-05 951-331-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2012-04-03 951-335-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C RIVERSIDE CA
2012-03-28 951-337-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2012-03-28 951-337-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MORENO CA
2012-03-27 951-331-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K TEMECULA CA
2012-03-22 951-271-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CORONA CA
2012-03-20 951-373-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ARLINGTON CA
2012-03-12 951-400-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C PERRIS CA
2012-03-12 951-400-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C PERRIS CA
2012-03-12 951-900-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C RIVERSIDE CA
2012-03-12 951-900-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C RIVERSIDE CA
2012-03-07 951-331-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2012-03-07 951-331-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2012-03-01 951-331-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 TEMECULA CA
2012-02-29 951-373-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2012-02-21 951-609-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D ELSINORE CA
2012-02-21 951-666-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CORONA CA
2012-02-17 951-322-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-02-17 951-322-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2012-02-16 951-356-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.